The sombre resonance of these figures that still look down on the stop where I change buses every week-day morning and evening rarely fails to move me. Without a doubt, James Russell Cant's giant prints are the most powerful public artwork I've come across. Taking photographs of photographs is an odd thing to do, I know. They're irresistible. In times of particularly relentless self-obsession, I guess I appreciate even more than usual the things that regularly pull my attention outwards. I note that when these first appeared nearly eighteen months ago I presumed their welcome presence at the grim Elephant and Castle road junction would be very temporary. How wonderful that this has proved not to be the case. The longer they stay, the more powerful their presence and the more powerfully they embody the opposite of boring, ephemeral or trivialised, the opposite of what is embodied by too much of the London streetscape.